Terrible service by Multichoice

I decided to re-use my old DSTV decoder and I was charged for 2 months by Multichoice yet the decoder is not working meaning I'm being charged yet I don't get the service. This is a serious *******. I called their call centres and the issue couldn't be resolved until I contacted the technician, at my own expense who advised me that the decoder won't work because it hasn't been used for more than 6 months. How ridiculous and why wasn't I informed about this upfront? Multichoice must resolve this but I know they won't which is why they are losing clients and why I left initially. It just so happened that I want to connect my mom at her home